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Loans (Summary of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Summary of loans under portfolio      
Commercial loan $ 3,081,931us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 3,084,024us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 2,586,653us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Consumer loan 2,620,943us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer 2,604,206us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer 2,166,636us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
Total loans 5,702,874us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 5,688,230us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 4,753,289us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial [Member]      
Summary of loans under portfolio      
Commercial loan 1,356,169us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember		 1,354,881us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember		 1,208,641us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_CommercialLoansMember
Real estate commercial [Member]      
Summary of loans under portfolio      
Commercial loan 1,616,923us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateCommercialLoansMember		 1,557,648us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateCommercialLoansMember		 1,279,167us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateCommercialLoansMember
Real estate construction [Member]      
Summary of loans under portfolio      
Commercial loan 95,923us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember		 152,745us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember		 85,084us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateConstructionLoansMember
Land development [Member]      
Summary of loans under portfolio      
Commercial loan 12,916us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember		 18,750us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember		 13,761us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_LandDevelopmentLoansMember
Real estate residential [Member]      
Summary of loans under portfolio      
Consumer loan 1,117,445us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember		 1,110,390us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember		 962,009us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_RealEstateResidentialLoansMember
Consumer installment [Member]      
Summary of loans under portfolio      
Consumer loan 844,066us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerInstallmentLoansMember		 829,570us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerInstallmentLoansMember		 675,412us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_ConsumerInstallmentLoansMember
Home equity [Member]      
Summary of loans under portfolio      
Consumer loan $ 659,432us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_HomeEquityLoansMember		 $ 664,246us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_HomeEquityLoansMember		 $ 529,215us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= chfc_HomeEquityLoansMember